depth of field (1 Viewer)

Hi I thougt I had mastered this digiscoing art. but NO..another worm has appeared out of the woodwork.the dreaded [D.O.F] how can i acheive a greater D.O.F. i submitted three images for comments and replies were of the opinion focus ok.but D.O.F. SHALLOW.ANY COMMENTS MOST WELCOME.camera contax tvs scope swarovski 80 hd eyepiece 20/60 zoom.Sorry to keep asking questions Immages shot mostly f2.8 manual focus infinity.30x.regards john. see image attached.

John,

Looking at the shots it looks more like distortion. In the first shot the bird is in focus and the rock it's standing on goes out of focus as it gets to the edge. You may want to check the setup you are using to attach the camera.

Drop your focal ratio dwon from f2.8.

The lower the number the shallower the DOF.

I often use f22 if Im after a really deep DOF, but of course, you will have to compensate for the lower light levels by either increasing your ISO speed, or slowing the exposure times down.

hth